concrete syntax: change &> to . for field access. What was I thinking?
examples: remove deprecated file (see file.ivory for concrete examples).
concrete syntax: c-like types in struct defs.
concrete syntax: builtin functions syntax, add cast functions.
concrete syntax: bug (unary op is binary op).
ivory lang: add twosComplementRep to cast from signed to unsigned
representation.
concrete syntax: add twosComplementRep (signed to unsigned).
ivory-language: export both twos complement methods.
concrete syntax: add hex digits, bitCast.
clean out testing cruft.
concrete syntax: add more examples.